Sub-8-fs pulses from an ultrabroadband optical parametric amplifier in the visible Cerullo, G. ; Nisoli, M. ; Stagira, S. ; De Silvestri, S. Abstract Publication: Optics Letters Pub Date: August 1998 DOI: 10.1364/OL.23.001283 Bibcode: 1998OptL...23.1283C